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首页> 外文期刊>Current Science: A Fortnightly Journal of Research >Textural variation in the crustal xenoliths in basic dykes, Western Deccan Volcanic Province, Maharashtra, India: evidence of partial melting and pyrometamorphism
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Textural variation in the crustal xenoliths in basic dykes, Western Deccan Volcanic Province, Maharashtra, India: evidence of partial melting and pyrometamorphism

机译：基础堤防，西德坎火山省，印度马哈拉施特拉邦的地壳Xenoliths中的纹理变异：部分熔化和热测定术的证据

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In flood basalt provinces that cover Precambrian terrains, crustal xenoliths are rare. But when present in lava flows and in intrusives, they provide direct information about the basement composition and upper lithospheric crust. Although dykes hosting xenoliths are not common in Deccan Volcanic Province, there are a few known occurrences of mantle and/or crustal xenoliths in some dykes from Maharashtra and Madhya Pradesh, India. The NE-SW dykes from Western Deccan Volcanic Province of upland Maharashtra host crustal xenoliths exhibiting textural variation. Petrographic studies of these xenoliths were not dealt with in detail earlier. We document here, a detailed petrographic work, signifying the importance of pyrometamorphic changes in xenoliths, to understand the composition and explain the textural variation. Presence of elongated quartz ribbons, neocrystallization, incorporation of basaltic melt into mineral cracks, complex twinning in feldspars, exsolved Fe-oxide and silica melt inclusions represent high temperature effects. Major oxide data is suggestive of peraluminous nature of the xenoliths while high temperature minerals tridymite and mullite observed from X-ray diffractograms indicate pyrometamorphic effects. The original rock is quite completely transformed by various processes like partial melting, incipient hybridization and pyrometamorphism, leaving very little mineralogical and textural traces that give evidence of the original protolith. These processes explain the textural variation observed in these upper crustal xenoliths, which could be termed as buchites or buchite rocks.
机译：在洪水玄武岩省份，覆盖前锋地区，地壳Xenoliths很少见。但是，当在熔岩流动和侵入物中存在时，它们提供有关地下室组成和上部岩石壳的直接信息。虽然托管Xenoliths在Deccan火山省托管蚊子，但是来自印度马哈拉施特拉和Madhya Pradesh的一些堤坝出现了一些已知的地幔和/或地壳Xenoliths。来自西德坎火山普通马哈拉施特拉邦的NE-SW迪卡斯举办地壳Xenoliths表现出纹理变异。早先没有详细涉及这些Xenoliths的岩体研究。我们在此记录在此，一项详细的岩型工作，致力于Xenoliths在Xenoliths中变化的重要性，了解组合物并解释纹理变异。细长石英丝带的存在，新晶体化，玄武岩熔体掺入矿物裂缝，在长石中的复杂孪生，exsolved fe氧化物和二氧化硅熔体夹杂物代表高温效应。主要氧化物数据是Xenoliths的尿素尿素的刺激性，而从X射线衍射图观察到的高温矿物质和莫来石表示pyrometmorphic效应。原始岩石通过部分熔化，初始杂交和热测定术等各种方法完全改变，留下非常小的矿物学和纹理痕迹，赋予原始促果实的证据。这些过程解释了在这些上层外壳中观察到的纹理变化，其可以被称为Buchites或Buchite岩石。

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